jones



anni swagptan aan.

JENKIN E. JoNEs, or LAUREL RUN, PENNSYLVANIA.

Letters 'Patent No. 102,681, dated May 3, 1870.

VENTILATOR FOR MINES.

The Schedule referred to in these Letters Patent and making part of the same.

' tion.

The-nature of my invention consists in providing lthe main shaft of a mine with doors, to be operated as and for the purpose hereinafter stated.

In order to enable others skilled in -the art to which my invention appertains to make and use the same, I will -now proceed to describe its construction and operation, ,referring to the annexed drawings, in which- Figure'lvis a side elevation, and

Figure 2 a front View.

In all mines above and onall sides of the main shaft there is always a considerable amount of framework, which, in a great many places, extends for hundreds of feetin all directions, and is more or less lia-ble to catch fire. When such is the case, the draught downward through the main shaft causes all the smoke,

Sac., to descend into themine, and suffoc-ate the workmen employed therein.

To obviate this danger is the object of my invention. I

In the annexed drawings- A represents the frame-work above the mine, and B, the main shalt, through which latter the platform o r basket C is moved np'and down in the usual manner.

The bars :t a: represent the surface of vthe ground below which the shafts run any desired distance.

The mouth or.opening of the main shaft B is provided with heavy iron doors D D, which I propose making about eight inches thick.

These doorsare hinged at the outer edges of the mouth of the shaft, land meet at the center, theybeing placed on an incline from the center downward,

. the ends of the entrance being provided with suitable brick, stOne, or iron supports E, as shown in iig. 1, for the ends of the door to rest upon. Also, an

viron plate above the brick or stone around the entrance. A

.ihe doors D D are, by ropes or chains a a., which pass over suitable pulleys, connected with weights G Gr, which balance the doors. placed at any distance from the entranceof the shaft, so that -at the first alarm of lire any body can, by merely raising the weights, close the doors. The

.doors and weights balancing each other, it requires a very slight exertion to either raise or lower them.

The main shaft is connected with another shaft, I, att-he mouth of which the usual fan is placed. By this means a plentiful supply of air is always admitted into the mine, even when the doors l) D are closed,

In the auxiliary shaft'H there may be, if so desired, another hoisting-apparatus 'for theegress of the miners in case of accident.

The doors D D may also be closed during the night in cold weather to prevent freezing in the main shaft.

Having thus fully described my invention,

What I claim as new, and desire to secure by Letters Patent, is

Providing the main shaft of a mine with doors, arranged to b e operated substantially as and for the purposes described.

In testimony that I claim the foregoing as my own, I aflix my signature in` presence of two witnesses.

JENKIN B. JONES.

Witnesses:

T.. H. ALEXANDER, EDM. F. BROWN.

These weights may be 

